LED's are really nice from what i have read. There low heat, and low watt. Though they tend to be more $$$$. Some people on RC have experiance with LED's
I thought that i might try one on a smaller tank to see how they do compared to t-5's.
I have 3 sets over my 125 vho set up. They give awesome shimmer with actinics only and pretty good shimmer when the whites come on. LEDs last forever so If you need them for shimmer supplement they are great. Otherwise, They would'nt be powerfull enough for anything other than a very small nano.